My experience with this (in Nevada) has been that the slot will keep track of your total credit value and cumulative winnings, so if you play a $30 credit for 1

My experience with this (in Nevada) has been that the slot will keep track of your total credit value and cumulative winnings, so if you play a $30 credit for 10 minutes and hit "cash out," it should give you your total winnings, while keeping the remaining credit in the machine. ie. you don't need to print a cash out voucher every time you win. For anyone in the bay area, Grand Sierra in Reno has the best promotions I've encountered for free play ($50-100) and free weekend hotel rooms.